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How to plan a home renovation
Lahav Meiri, licensed renovation contractor · Published 3 August 2026
Planning a renovation isn't the same as planning a new build, and the difference works in your favour. You're already living in the evidence - you know exactly what fails, because it fails on you every day. What you're negotiating with is the building itself, which has its own opinion about what's possible.
Most renovation guides give you a sequence of steps. This is about what that sequence can't tell you: what the building will allow, and what happens when you open it up.
One thing worth knowing before you start: the last section is what to work out before you call anyone. It's the part that decides how the rest goes.
You're already standing in the answer
Someone building from scratch has to imagine how they'll live. You don't. You've been running the experiment for years.
Every daily irritation is a specification. The door that opens into the fridge. The room that's too cold in February. The place everyone drops their bags because there's nowhere else. You already know all of it - it just hasn't been written down.
Most people skip past this and go straight to inspiration images, which is the one part of the process a new build does better. The photos are somebody else's answer. Your house is yours.
Do this before anything else: walk through the place with a notebook, room by room, and write down what annoys you. Not what you want - what's wrong. Take a week if you need to, because half of it only surfaces when it happens.
That list is worth more to a designer than anything you'll find online.
The photos are somebody else's answer. Your house is yours
The building has an opinion
In a new build, almost everything is possible until you decide otherwise. In a renovation, a lot is decided already, and the sooner you know which parts, the less time you waste designing things that can't happen.
What's usually fixed
Structural walls and where loads come down. The position of the stack and main drainage. Ceiling heights, mostly. External walls, if there's any planning constraint. Anything shared with a neighbour.
What usually flexes, at a cost
Internal walls. Window openings. Where the kitchen and bathrooms sit. Ceiling heights in one direction. Almost all of these are possible - the question is what they cost, not whether they can be done.
What nobody can tell you until they look
What's actually inside the walls. The condition of what's behind the plaster. Whether previous work was done properly.
The practical move: find out what's fixed before you fall in love with a layout. One visit from someone who reads buildings - a structural engineer, an architect, a builder who's seen a hundred of these - will tell you more than weeks of drawing. Do it early, while the plan is still a sketch.
Discovery, not surprise
Every renovation has a moment where something opens up and the plan changes. This isn't a risk. It's a certainty, and the difference matters, because you plan for certainties.
Among homeowners who exceeded their renovation budget, 35% chose more expensive materials than planned and 31% expanded the scope mid-project. Only 22% cited construction issues discovered once work was underway.
Read that again, because it isn't what people expect. The building surprises you less often than you surprise yourself. Most overruns come from decisions made while the work is happening - a better tile, one more wall, since we're in here anyway.
Which is good news, because that part is yours to control.
Decide in advance what flexes. Before work starts, write down what you would sacrifice if the number moved, and in what order. Then when the wall comes down and there's a decision to make on the spot, you're not making it under pressure with a builder waiting.
And hold a real contingency. Ask your builder what's sensible for your specific building and its age. Anyone who gives you a percentage without looking at it is guessing.
Two ways the same discovery lands
The building surprises you less often than you surprise yourself
The cost nobody budgets
Renovation has one cost that a new build doesn't, and it never appears on a quote.
You're either living in it or paying to live somewhere else.
Living in it means dust, noise, no kitchen, strangers in the house at seven in the morning, and a project that becomes the only thing anyone talks about at home for months. Moving out means rent on top of everything else.
Neither is wrong. What's wrong is not deciding, and then discovering in week three that you can't do it.
Work out before you start:
Where you'll cook, and for how long. Where you'll sleep if the bedrooms come out. Whether the whole family can hold up under it, and for how many months. What your actual limit is - and say it out loud, so it's a plan rather than a breaking point.
And ask your builder to sequence for it. A project can often be phased to keep one bathroom or one kitchen alive longer. It costs a little more and it's frequently worth it.
What to work out before you call anyone
None of this requires a professional. All of it makes the professional more useful.
What's actually wrong with this house?
The list from section one. Specific, room by room.
What do you want that this house currently prevents?
Different from what's wrong. This is the ambition, not the fault.
Which of your problems are layout, and which are condition?
A cold, dark, badly finished room is a different project from a room in the wrong place. They cost differently and they're solved differently.
What's your number, and does it include everything?
Design fees, permits, contingency, and somewhere to live if you leave.
How long can you live in it?
The honest answer, not the brave one.
What would you drop first?
Before anyone asks. That's the decision that protects the project.
Those are the questions worth answering first. Nestbrief works through them with you.
See how it works →The honest answer, not the brave one
The evidence is already in the house
A renovation gives you something a new build never does: years of data about how you actually live, collected in the place you're about to change. Almost nobody uses it. They start with pictures instead, and end up asking a designer to solve a problem nobody has written down.
Nestbrief asks you those questions one at a time, at home, at your own pace. When you say you want a bigger kitchen, it asks what for. When you're not sure, it helps you think it through instead of moving on. Nothing to prepare, nothing to fill in - you just talk.
This is what comes out of it:
One conversation, and everything you already knew is written down.
Common questions
- Do I need an architect for a renovation?
- Depends what you're changing. Moving structure, altering the envelope, or anything needing permission usually does. Replacing a kitchen in the same footprint usually doesn't.
- How long should planning take?
- Longer than the excitement wants it to. Every decision made on paper is one not made on site, where it costs more and you have less time.
- Should I get a survey before I design?
- For anything structural, yes. Designing against assumed dimensions is how plans get redrawn.
- Is it cheaper to renovate or to move?
- It depends entirely on your building and your market, and anyone answering it in general is guessing. What's often overlooked in the comparison is the cost of living through it.